Magnetic open, single-flange glass adapters are constructed with Corning 7052 Borosilicate glass. They are available with expansion-matched Nickel-Iron-Cobalt (Kovar) metal transition tubes. These open end adapters are ideally suited for high and ultrahigh vacuum applications where joining to other laboratory glass or apparatus is required. Available in four (4) glass tube sizes including 1/2, 3/4, 1-1/2 and 2-1/2 inch diameters. NOTE that glass-to-metal sealing is more of an art than a science, as such (other than tube and mounting flange dimensions) all glass dimensions are nominal, and only for reference. Glass overall lengths can vary significantly from one assembly to another.